Only in one way is mind a condition for matter: Subsequent consciousness and mental factors are a condition for the preceding (material) body by way of postnascence.

Postnascence condition is a condition where a conditioning state assists conditioned states that has arisen prior to itself by supporting and strengthening them. The conditioning states in this relation are subsequently-arisen cittas and cetasikas. The conditioned states are the material phenomena of the body born of all four causes which material phenomena had arisen along with preceding cittas. This condition begins with the first bhavanga in relation to the material phenomena born of kamma at the moment of rebirth-linking. Just as the rainwater that falls later promotes the growth and development of the already existing vegetation, so the subsequently-arisen mental states support the pre-arisen material phenomena so that theycontinue to produce similar material phenomena in succession.

Only in one way is a matter a condition for mind : The six bases during the course of existence are a condition for the seven elements of consciousness, and the five objects for the five processes of sense consciousness, by way of prenascence.

Prenascence condition is a condition where a conditioning state --a material state which has already arisen and reached the stage of presence (thiti)-- causes mental states, the conditioned states, to arise after it. This is like the sun, which arises first in the world and gives light to people who appear after it has arisen. There are two main types of prenascence condition, (i) base prenascence (vatthu-purejaata) and (ii) object prenascence (aaramma.na-purejaata).

(i) Each of the six physical bases during the course of existence is a conditioning state by way of base prenascence for the citta and cetasikas --the conditioned states-- that take it as the material support for their arising. The heart-base is not a prenascence condition for the mental states at the moment of rebirth-linking, since on that occasion the heart-base and mental states arise simultaneously as conascence and mutuality conditions. But the heart-base arisen at the rebirth moment becomes a prenascence condition for the first bhavanga citta immediatetly following the rebirth consciousness, and thereafter it becomes a prenascence condition for all mind-element and mind-consciousness-element cittas during the course of life.

(ii) Each of the five sense objects is a conditioning state by way of object prenascence for the citta and cetasikas in a sense door cognitive process that take it as object. In addition, all eighteen types of concretely produced matter that have reached the stage of presence can become object prenascence condition for the cittas and cetasikas in a mind-door process.